NASA astronaut completes Boston Marathon on orbit

On Monday an American astronaut became the first to run the Boston Marathon in space. Suni Williams took four hours 23 minutes and 46 seconds to complete the 26.2 miles on a treadmill in the ISS, Reuters reports.

On Earth, Williams has run marathons in about 3-1/2 hours.

Williams said in a media briefing early this month: "Just the fact that I'm running that much slower is going to be a little bit tedious because it's going to be a long time on the treadmill."

Race officials were not able to calculate her finishing spot immediately, but based on last year's results, she would be ranked at about 6,300th place among about 7,600 women runners.

Williams ran in steady 75 degree Fahrenheit (23.8 Celsius) temperatures in the still air of the space station.